Coherent and Polarized Random Laser Emissions from Colloidal CdSe/ZnS Quantum Dots Plasmonically Coupled to Ellipsoidal Ag Nanoparticles

Yung Chi Yao, Zu Po Yang, Jung Min Hwang, Hai Ching Su, Jing Yu Haung, Tzu Neng Lin, Ji Lin Shen, Min Hung Lee, Meng Tsan Tsai, Ya Ju Lee

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

This study demonstrates the capability of controlling optical anisotropy of lasing emissions by manipulating the coupling strength spatially and spectrally between the oscillated electric field of emitted light and the localized surface plasmon (LSP) resonance for a random lasing medium composed of colloidal CdSe/ZnS quantum dots (QDs) and ellipsoidal silver nanoparticles (Ag NPs). Distinctive from the amplified spontaneous emission generally observed on colloidal CdSe/ZnS QDs, it has been found that lasing emissions of the revealed system exhibit clear interference features (coherent optical feedbacks) with low-threshold characteristics, mainly attributed to enhanced light scatterings and optical gains arisen in peripheral surfaces of ellipsoidal Ag NPs. Importantly, the relative orientation, between the oscillated electric field of emitted light from colloidal CdSe/ZnS QDs and the ellipse axis of Ag NPs, plays a critical role in selective excitation of LSP resonances leading to laser emissions with preferential optical polarizations. The achievement of spatial and spectral coupling of LSP resonance with colloidal QDs, respectively, by spin coating thin QDs film on Ag NPs and control of the Ag NP geometry makes the present system one of the promising candidates of colloidal QDs-based random lasers to achieve coherent and polarized lasing emissions.

Original languageEnglish
Article number1600746
JournalAdvanced Optical Materials
Volume5
Issue number3
DOIs
Publication statusPublished - 2017 Feb 2

Fingerprint

Semiconductor quantum dots
quantum dots
Nanoparticles
nanoparticles
lasing
Lasers
Surface plasmon resonance
surface plasmon resonance
lasers
Electric fields
Optical anisotropy
Optical feedback
Optical gain
optical polarization
electric fields
Spontaneous emission
Spin coating
ellipses
Light polarization
Silver

Keywords

  • coherent random laser
  • colloidal quantum dots
  • localized surface plasmon resonance
  • polarized emission

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

Cite this

Coherent and Polarized Random Laser Emissions from Colloidal CdSe/ZnS Quantum Dots Plasmonically Coupled to Ellipsoidal Ag Nanoparticles. / Yao, Yung Chi; Yang, Zu Po; Hwang, Jung Min; Su, Hai Ching; Haung, Jing Yu; Lin, Tzu Neng; Shen, Ji Lin; Lee, Min Hung; Tsai, Meng Tsan; Lee, Ya Ju.

In: Advanced Optical Materials, Vol. 5, No. 3, 1600746, 02.02.2017.

Research output: Contribution to journalArticle

Yao, Yung Chi ; Yang, Zu Po ; Hwang, Jung Min ; Su, Hai Ching ; Haung, Jing Yu ; Lin, Tzu Neng ; Shen, Ji Lin ; Lee, Min Hung ; Tsai, Meng Tsan ; Lee, Ya Ju. / Coherent and Polarized Random Laser Emissions from Colloidal CdSe/ZnS Quantum Dots Plasmonically Coupled to Ellipsoidal Ag Nanoparticles. In: Advanced Optical Materials. 2017 ; Vol. 5, No. 3.
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